Gumming and filing machine.



v A. L. KIRKWOOD.

GUMMING AND FILING MACHINE. APPLICATION FILED SEPT. 18, 1911.

1,065,877. I I Patented June 24, 1913.

5 SHEER-SHEET 1.

$0 100 I *1 1106 i5 k0) o l I IIIIP 9 {2 I T4.

WIT/VES'ES 28 4 mavro $92M v I firdmmm ATTORNEYS COLUMBIA PLANOGRAPHCO..WASHINGTDN. D. c,

WITNESSES A. L. KIRKWOOD.

GUMMING AND FILING MACHINE.

APPLICATION FILED SEPT. 18, 1911.

Patented June 24, 1913.

5 SHEETSSHEET 2.

COLUMIHA PLANUHRAI'H C0,,WASIIINGTON. n.c.

11 INVENTOR Am ATTORNEYS A. L. KIRKWOOD.

GUMMING AND FILING MACHINE.

APPLICATION FILED SEPT. 18, 1911.

1,065,877, Patented June 24, 1913.

5 SHEETS-SHEET 3.

a gfr WITNESSES I WW0; v flraamffikwaati f L By I ATTORNEYS COLUMBIAPLANOGRAPH IO-.WASHINGTOH. D. 1.

, AVPPLIOATION FILED SEPT. 1's. 1911.

. A. L. KIRKWOOD. MMING AND FILING MACHINE.

rammed June 24, 913.

5 SHEETS-SHEET 4.

Mind I ATTORNEYS 1 COLUMBIA PLANOGRAPH :0 WASHINGTON. n. c.

I A. L. KIRKWOOD. GUMMING AND FILING MACHINE.

APYLIOAIION FILED SEPT. 18, 1911.

. fig, 6,

Patented June 24, 1913.

5 SHBETS-SHBET 5.

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ilNf ABRAHAM L. KIRKWOOD, 0F CADDO GAP, ARKANSAS.

GUMMING AND FILING MACHINE.

To all whom it may concern:

Be it known that I, ABRAHAM L. KIRK- woon, a citizen of the UnitedStates, and a resident of Caddo Gap, in the county of Montgomery andState of Arkansas, have invented a new and Improved Gumming and FilingMachine, of which the following is a full, clear, and exact description.

My invention comprehends a saw gumming and filing machine and the objectof my invention is to provide a construction having the followingcharacteristics: A suitable frame is provided with means for holding acircular saw in position thereon, there being an emery or othersharpening wheel revolubly and adjustably mounted on the frame, theconstruction and arrange ment being such that the wheel when revolvingwill engage in one the saw only at or above a certain speed; other meansare provided for moving the saw in order to bring each tooth intosuccessive engagement with the sharpening wheel, there being anautomatic vise or clamp for holding the saw in such successive position;other means are provided for dressing the sides of each tooth after thesharpening wheel has done its work, all of the above means collectivelyforming a unitary machine which may be driven by any suitable power andwhich when once set in motion requires no further personal attention.

Other objects and advantages of the invention will appear as thedescription of the machine proceeds, the new and novel features beingset forth and included within the appended claims.

Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar characters of reference denotecorresponding parts in all the views, and in which Figure 1 is a topplan view of the machine, the wheels used for dressing each tooth afterfiling being omitted for the sake of clearness, the locationof thismeans be ing indicated in dotted lines; Fig. 2 is a vertical sectionalview of the machine along the line 22 of Fig. 1; Fig. 3 is a verticalsectional view thereof along the line 33 of Fig. 1; Fig. 4 is a sideview of the ma chine as illustrated in Fig. 1; Fig. 5 is a sectionalview on the line 55 of Fig. 4; Fig. 6 is a front side view of a portionof the machine showing the means for dressing each tooth after filingand the means Specification of Letters Patent. Application filedSeptember 18, 1911.

of the teeth of 'vided with projecting Patented June 24:, 1913. SerialNo. 649,812.

for rotating the saw; Fig. 7 is a vertical sectional View along the line77 of Fig. 6; Fig. 8 is a top plan view of the dressing wheels showingthe adjustable mounting thereof; Fig. 9 is a partial vertical sectionalview 0 the line 9-'9 of Fig. 2 showing the locking meansfor maintainingthe sharpening wheel in elevated position until a certain speed isreached.

The machine comprises a frame of any suitable or desirable outline,preferably of the configuration shown in Figs. 1 and 2, there being anumber of uprights 1, located at different corners and intermediate ofthe ends,the uprights being connected together by a plurality ofhorizontal members 2 in order to form a rigid structure. Suitablysecured adjacent one end of the frame is a shaft 3 mounted in bearings4, one end of the shaft being provided with a driving pulley 5, therebeing another pulley 6 intermediate of the ends, the inner end of theshaft being provided with a worm 7. Adjacent the upper portion of theframe and preferably opposite the shaft 3 is another shaft 8 having apulley 9 thereon around which and the pulley 6 a belt 10 passes wherebythis second shaft 8 may be turned, this shaft being further providedwith a suitable pulley 11 for operating the wheels which dress the teethof the saw, there being another pulley 12 also mounted on this shaftaround which the belt 13 passes, this belt being used for conveyingpower to a suitable grinding wheel 14. The wheel 14 is mounted on asuitable shaft 15 carried in bearings 16, the bearings being supportedon a movable frame which may be denoted as a whole by 17, this framebeing slidable up and down on fixed uprights 44, in a manner to behereinafter described.

Extending transversely of the frame members 1 is an inner shaft 19mounted in suitable bearings 20, one end of the shaft being providedwith a worm gear 21 meshing with the before-mentioned worm 7 on the endof the shaft 3, this shaft 3 serving as a main power shaft, the turningthereof being communicated to the shafts 15, 8 and 19 by the meansmentioned. The shaft 19 is provided intermediate its ends with aplurality of cams 22, 23, 24, each of which is irregular in outline thecams being proportions 22, 23, 2st.

Extending longitudinally of the machine are a number of levers 25, 26,27, (Fig. 1)

one of which, 25, is pivotally supported at 28 adjacent one end of themachine and the others of which, are pivotally supported at 29 adjacentthe opposite end of the machine. These levers are actuated by theaforementioned cams 22, 23, 24, and in order to provide for ease ofoperation, each lever is preferably provided with a roller 30, 31, 32,engaging the cams whereby the friction of the parts is reduced.

Extending upwardly from the lever 25 is a rod 33 having a threadedportion 34 thereon, the lower end of this rod being pro vided with abifurcated member 35 having a roller 36 between its ends engaging thelever, the threaded portion of the rod engaging in a threadec openingprovided adjacent the lower end of the frame 17 the upper end of the rodbeing handle 37 whereby it may be turned, the rod also engaging theupper end of the frame 17; this frame 17 is made up of the horizontallyextending portions 38 which carry the bearings 16, these portions beingconnected together by cross pieces 39, there being a downwardly andvertically extending member 40 having an offset lower end portion 41which is provided with a suitable opening, this end being also providedwith an oppositely extending boss 42 carrying the threaded opening whichengages with the threaded portion 34 of the rod 33, this boss being inline with a similar boss 43 adjacent the top of this member; thepreviously mentioned fixed uprights 44 carried by the frame of themachine, pass through openings in the pieces 41 and other openingsadjacentthe top of the frame which are in line with the lower openings,the uprights being so positioned that as the handle 37 is turned thethreaded engagement between the rod 33 and the frame 17 will raise andlower the frame and with it the sharpening wheel 14. As the shaft 19turns, the cam 24 will raise and lower the rod 33 and with it the frame17 and the sharpening wheel 14. This wheel comes into contact with eachsuccessive tooth of the circular saw, which is held by means to bepresently described, and the frame 17 in the operation of the machine isfixed with respect to the rod 33 so that once the relation of theseparts is determined no further adjustment is necessary unless a saw ofdifferent size is placed in the machine.

Since it is desirable in filing the saw that the speed of the sharpeningwheel be at least of a certain amount I have provided an automaticregulating device which insures that the sharpening wheel will not bemoved adjacent the teeth of the saw until a oer tain speed is reached,preferably 900 revolutions a minute, this device being constructed andarranged as follows: Secured to the outer end of the shaft 8 by anysuitable means, such as a key 45 is a sleeve 46 having provided with aslots 47 in opposite sides thereof, the outer end of the sleevecontaining an adjustable plug 48 having an opening therethro-ugh, therebeing a rod 49 extending through this plug and into the interior of thesleeve 46; extending transversely of the sleeve and through the slots 47therein is a pin 50 in engagement with the rod 49, the pin being held atone end of the slots when the machine is not in operation by means of ahelical spring 51, one end of which engages the pin 50 and the other endof which engages in the plug 48. The outer end of the rod 49 has a block52 secured thereto in any suitable manner, preferably by the engagementof a groove 53 on the outside of the rod, the block being made in twopieces and held together by positioning pins 54, this block engaging inthe upper end of a lever 55 pivotally secured at an intermediate point56 to one of the frame members whereby movement of the rod 49 backandforth through the medium of a pin and slot connection 57 will actuatethe lever about its point of pivotal support; pivotally secured atoppositepoints of the sleeve 46 are levers 58, the outer end of eachcontaining a weight or ball 59 of suitable mass, the balls beingconnected to the transversely extending pin 50 in the sleeve by means oflinks 60, the idea being that as the shaft 8 rotates the balls 59 willbe thrown outwardly by centrifugal force, thereby moving the rod 49within the sleeve 46 and moving the lever 55 about its support.

Pivotally secured to the lever 25 (Fig. 2) and at a suitable distancefrom the rod 33 is another rod 33 preferably provided with a bifurcatedend portion 33 whereby it may be secured to the lever 25, one side ofthis rod adjacent its upperend being provided with a recess 61 (see Fig.9) there being a slidable element 62 (Fig. 4) supported by the frame ofthe machine adjacent this rod 33, one end of the element beingpositioned within the said recess; one end of this element 62 isprovided with an upstanding portion 63 the element being movably fixedwith relation to the rod through the medium of helical springs 65, 66,carried by the rod, one end of each spring engaging the end portion 63so that while the element 62 is actuated by the rod 64 the movement is aresilient one because of these springs 65,66; extending transversely ofthe machine is a shaft 67 (Fig. 1) having a short lever 68 securedthereto intermediate its ends, the upper end of this lever being inpivotal engagement at 69 with one end of the beforementioned rod 64 sothat turning of the shaft 67 in either direction will actuate theslidable element 62, thereby moving it into or out of position withinthe recess 61 in the side of the rod 33'; the outer end of this throughwhich a rod 64 extends, V

1 centrifugal device will shaft 67 is provided with a lever 70 (Fig. 4),the lower end of which is in pivotal engagement, as at 71, with a link72, the other end of this link being in pivotal engagement at 73 withthe lower end of the before mentioned lever 55 which is in engagement atits upper end with the rod 49 actuated by the centrifugal device. Thusit will be seen that in the operation of the machine the not move theslidable element 62 out of the recess 61 in the rod 33 until a certainspeed is reached so that, while the sharpening wheel 14 may be rotatingin the frame 17 which supports it, it is held against movement on theuprights 44 until this predetermined speed is reached, because of theengagement of the end of the element 62 with the rod 33 in the recesstherein, this rod being permitted a slight up and down movement becauseof the length of the recess 61; the lever 25 which actuates both rods 33and 33 through the engagement of the cam 24' therewith moves up and downa distance equal to the length of the recess 61 when the sliding element62 is positioned therein. Of course after the speed of the machinereaches 900 revolutions per minute the element 62 moves out of therecess 61 and the rods 33 and 33 can then move up and down a distanceequal to the height of the cam 24 which distance'is sufficient to carrythe sharpening wheel 14 adjacent the saw and into engagement with anyone of the teeth.

The circular saw 74 is suitably mounted in a carriage 75 which movesback and forth on a supporting member 76, there being a longitudinallyextending threaded shaft 77 engaging the carriage 75 by means of athreaded opening therein; the supporting member 76 is provided on itsupper side with a slot 78, the carriage 75 being provided with an offsetportion 79 engaging in the slot so that the carriage is guided in itsmovement along the supporting member. The threaded shaft 77 is suitablysupported in bearings 80 at opposite ends of the supporting member 76,one end of the shaft being squared as at 81 or provided with any othersuitable means whereby it may be turned in order to move the carriage 75along the supporting member; the saw 74 may be supported in anydesirable 0r suitable manner on the carriage, the preferred device beinga clamping means, such as a wedge 82 engaging a transversely extendingbolt- 83. The supporting member 76 is movable up and down in order toadjust saws of different diameters to the grinding wheel and to this endit is provided with threaded blocks 84 through which threaded shafts 85extend, the upper end of one of the shafts being provided with asuitable in order to provide equal movementof each end of the supportingmember the threaded handle 86 shafts 85 being connected by means of achain 87 which engages with suitable sprockets 88 at the lower ends ofthese threaded shafts. After the saw has been secured in the carriage 75the supporting member 76 is brought to the proper height by operation ofthe handle 86, the threaded shaft 77 being then turned to move thecarriage along the supporting member; in order to make the saw and thecarriage rigid on the frame the supporting member may be provided for aportion of its length with a suitable longitudinally extending slot 89,in order to receive a threaded extension member 90 extending rearwardlyof the carriage 75, (see Fig. 3) the outer end of this threaded memberhaving a suitable clamping handle 91 thereon whereby the position of thecarriage may be fixed by tightening this handle. The saw 74, althoughfirml held on the carriage 75, is yet rotatable thereon in order topermit the successive teeth to be brought adjacent the sharpening wheel14; other means adjacent the top of the saw are provided to clamp itwhile any particular tooth is being gummed or filed, such means beingautomatic in operation and acting periodically. A vertically extendinglink 92 is pivotally secured adjacent its lower end at 93 to one of thelongitudinally extending levers 27, (Fig. 3), the upper end of this linkbeing in pivotal engagement at 94 with a lever 95 mounted on alongitudinally extending shaft 96; also carried by the shaft 96 andextending preferably in a direction at 90 to the direction of the lever95 is another lever 97 which is pivotally engaged at 98 with one end ofa link 99 which is adapted to actuate the vise or clamping means for thesaw and also regulate the movement of the dressing wheels.

Referring particularly to Figs. 2, 6 and 7 it will be noted thatadjacent the top of the machine and secured thereto in any desirablemanner is a support 106, the outer end of which is provided on one sidewith a lug 102, this lug being secured in position by any suitable meanssuch as nuts 103, the lug being adapted to engage one side of the circular saw 74; the opposite side of the saw 74 is periodically engaged bya suitable resilient co-acting plug, the construction of which is shownin Fig. 7, there being a sleeve 105 secured adjacent the outer end ofthe lever 101 which is pivotally supported at to the machine frame; theouter end of this sleeve receives one end of a plug 107 having a reducedand threaded opposite end 108 secured in position within the sleeve byany means, such as a nut 109; the plug is retained in position as shownin Fig. 7 through the medium of a helical spring 110 positioned withinthe sleeve. As the shaft 19 (see Fig. 3) revolves, the cam surface 22 Ithereon will actuate the link 92 which in turn will oscillate the shaft96 through the medium of the lever 95, the link 99 being in turnreciprocated through the medium of the lever 97 which is secured to theshaft 96, the movements of the link 99 carrying the outer end of thelever 101 (see Fig. 6) into and out of engagement with the saw 7 1,thereby alternately clamping it for grinding by the sharpening wheel 14and releasing it in order to be advanced by means to be subsequentlydescribed. Thus it will be noted that the saw 7 .t is firmly yetresiliently held between the opposite plugs 102, 107 while thesharpening'wheel 14: is operating on any tooth.

In order to dress the sides of each tooth after it has been gummed andfiled I make use of suitable dressing wheels, shown particularly inFigs. 6 and 8. A suitable table or other supporting device 111 issecured to the upper end of the frame of the machine,

there being a pair of arms 112, 113, pivotally secured at 11 1, 115 tothis table or support, the outer ends of the arms being provided withsuitable bearings 116 within which shafts are carried, the outer end ofeach shaft being provided With a Suitable pulley 117 and the adjacentends of these shafts being provided wit-h dressing wheels 118 arrangedas shown in Fig. 8 so that they may engage the opposite edge portions ofany tooth in order to dress the same after it has been filed. Thesupport or table is also provided with suit-able pulleys 119 aroundwhich a rope or wire belt 120 passes, the pulleys being provided inorder to change the direction of motion, this belt or pulley passingaround and engaging the small pulley 11 mounted on the shaft 8 at theopposite side of the machine. These wheels 118 are designed to actsimultaneously with the sharpening operation of the saw by the wheel 14Land in order to hold the sharpening wheel in engagement with any toothand to have the saw itself clamped at that instant, the wheels 118 alsobeing in operative position, I have arranged the cam surfaces 22, 2-1,in position on the shaft 19 so that when the link 99 moves outwardly andreleases the clamping lever 101 the filing wheel 11 is brought intoelevated position. Referring particularly to Fig. 8 it will be notedthat adjacent the pivoted ends of the arms 112, 113, and positionedbetween them is a longitudinally slidable element 121 movable on thetable or support 111 by means of pin and slot connections 122, theopposite sides of this element 121 being provided with pivoted members123, which engage the arms 112, 113, so that if the element 121 is movedlongitudinally of the table or support the arms 112, 113 will be movedapart, thereby moving the dressing wheels 118 remote from each other;these wheels, however, are retained in the position shown in Fig. 8through the medium of springs 124: positioned within openings in thearms, one end of one spring being in engagement with an upright 125secured to the table or sup- 7 port, each arm being adjustable throughthe medium of a set screw 126.

In order to move the element 121 along the table or support 111 I makeuse of a bell crank lever 127 pivotally secured at 128 to the table, oneend of the lever being in engagement with the element 121as at 129, theother end of this lever being provided with a downwardly extending pin130, this pin engaging in a suitable opening or recess 131, (see Fig. 3)in the link 99 so that when the link moves to the left to release theclamping lever 101 it will engage the pin 130, thereby moving the bellcrank 137 and moving the arms 112, 113 away from each other andproviding for the advancement of the saw between the dressing wheels118.

In order to rotate the saw at the proper times whereby each successivetooth is brought intoposition with respect to the sharpening wheels andthe dressing wheels I have provided suitable means which will be nowdescribed; extending vertically of the machine and positioned betweenthe rod 33 and the link 92 is a third rod 150, the lower end '95 ofwhich may be provided with a swivel connection 151 engaging in any oneof a desirable number of openings 152 adjacent the outer end of thelever 26, which lever is actuated by the cam surface 23' on the shaft19, the upper end of this rod being threaded, as at 153; extendingtransversely of the ma chine and adjacent the top is a shaft 15 1 havinga pair of arms 155, 156, carried thereby, one of the arms 155 beingadapted to be securely positioned on the shaft by any means, such as aset screw 157, the other arm 156 being provided adjacent its outer endwith any number of suitable openings 257 in any one of which a threadedblock 158 is adapted to be engaged, this threaded block engaging thethreaded end 153 of the rod 150, previously mentioned. The position ofthe arm 156 with respect to the lever 26 can be varied by means of theopenings 152, 257 and also by turning the rod 150 in order to move thelevers relatively to each other; the shaft 154 is adapted to beoscillated by means of the arm 155 and in order that the movement of thearm 156, which is freely supported on the shaft 155, may be communicatedthereto; the free end of the arm 155 is provided with an arcuate slot159 through which passes a suitable bolt 160 engaging the arm 156whereby tightening of the bolt will fix the relation between the arms155 and 156. One end of the shaft 154 is provided with an arm 161, theouter end of which is provided with a slot 162 into which a bolt 163extends, the bolt being positioned at the outer end of a link 164mounted adjacent the saw 74 and provided at its other end with a dog 165having a notch 166 adjacent its free end adapted to engage the point ofone of the teeth on the saw, the dog being movable about its support 167an being provided with a downwardly extending bifurcated member 168, thearms of which extend on opposite sides of the saw 74, the purpose ofthese arms being to maintain the proper position of the dog with respectto the saw. As the lever 26 is moved up and down by reason of itsengagement with the cam surface 23 the shaft 154 will be oscillated andthe link 164 carrying the dog 165 will successively move back and forth,coming into engagement with a succeeding tooth on the saw and thenturning the saw and bringing the said tooth into proper position to beengaged by the sharpening wheel 14.

It is to be noted in passing that in the operation of the clamping lever101 it is desirable that the pressure be maintained against the saw, theoperation chine moving the lever in order to carry it out of engagementwith the saw, this pressure being provided by means of a long arm 169secured to the shaft 96, there being a weight 170 at the outer endthereof of sufit cient mass and secured thereto by means of a set screw171; in some instances it may be desirable to release the clamping jaw101 without starting the machine, and to provide for this I haveextended the lever 169 to the opposite side of the shaft 96 whereby ashorter arm 169 is provided to which a link 171 is attached, the lowerend of the link being pivotally secured at 272 to a foot plate 172pivotally supported at173 to the frame of the machine.

While the operation of most of the parts has been set forth indescribing the struc ture of the machine, the use and operation thereofmay be summed up as follows: The saw 74 is suitably positioned in thecarriage 75; power is applied to the shaft 8 whereby the sharpeningwheel 14 is rotated, the wheel coming into and out of engagement witheach successive tooth of the saw after the proper speed has beenreached, the rela tion of the cams 22, 23, 24, with respect to eachother being such that when the sharpening wheel is lowered theclampingmeans' holds the saw rigidly in position and the dog 165 is outof the path of this sharpening wheel; the carriage 17 and the sharpeningwheel 14 are then brought into raised position, at which instant theclamping device or lever 101 is released and the dog 165 moves to bringthe next toot-h into line with the wheel; it is to be particularly notedthat when the clamping lever 101 is in operative position the dressingwheels 118 are closely adjacent and are finishing the sides of the ofthe matooth which has been previously ground. The relative positions ofthe cams 22, 23,

and 24 on the shaft 19 may be varied in order to make the travel of thesharpening wheel 14 more or less and to provide for various angles ofadvancement of the saw, depending on the character of the teeth thereon,such changes being within the scope of my invention and adapting themachine to gumming and filing different circular saws.

Having thus described my invention, I claim as new, and desire to secureby Letters Patent 1. A machine of the class described comprising meansfor holding a saw in position, grinding means embodying a movable framehaving a movable abrasive member therein, means for moving the frame andmember into and out of engagement with the teeth on the saw at or abovea certain speed, and means for moving the saw in order to bring theteeth successively into position for grinding.

2. A machine of the class described comprising a frame having meansthereon for holding a saw in position, a movable frame having a devicetherein for grinding the teeth on the saw, means whereby the said devicemay be operated, means for moving the frame and the device adjacent theteeth on the saw at or above a certain speed, and means for bringing theteeth on the saw successively into position to be ground.

3. A machine of the class described comprising a suitable frame havingmovable means thereon for supporting a saw, another frame having agrinding wheel thereon, means whereby the frame and grinding wheel maybe brought adjacentthe teeth on the saw, and means permitting suchmovement only at or above a certain speed.

4. A mach ne of the class described comprising a frame having a carriagethereon for supporting a saw, a frame having a sharpening wheel thereonadapted to engage the teeth on the saw, means for operating the grindingwheel, and other means whereby the grinding wheel may engage the teethat or above a certain speed.

5. In a machine of the class described, a suitable frame, a shaftcarried by the frame, a plurality of cams on the shaft, means forholding a saw in position on the frame, a sharpening device movablymounted on the frame, means actuated by one of the cams for raising andlowering the sharpening de vice, other means actuated by the same camwhereby the said raising and lowering occurs only at or above a certainspeed, and means actuated by the other cam for successively bringing theteeth of the saw into sharpening position.

6. A machine of the class described comprising a suitable frame, meansfor holding a saw in position thereon, a sharpening device movablymounted on fixed members, a shaft carried by the frame, cams actuated bythe shaft, means actuated by one of the cams for moving the sharpeningdevice on the uprights, other means actuated by another cam for bringingthe teeth on the saw successively into sharpening position, and othermeans actuated by a third cam for clamping the saw while any tooth isbeing ground.

7. A machine of the class described com prising a frame, a shaft mountedon the frame, cams on the shaft, means for rotatably holding a circularsaw in position on the frame, a second frame having a sharpening devicerevolubly mounted therein, the second frame being movable relatively tothe first frame, means for driving the sharpening device, a plurality oflevers pivotally supported on the first frame, a rod in engagement withone of the lovers and in operative relation with the said second framewhereby the frame and the sharpening de vice may be moved into and outof engagement with successive teeth, a rod connected to the second leverand in operative engagement with a clamping device whereby the saw isheld in position while any tooth is being sharpened, and means connectedto the third lever and embodying a dog for engagement with the teeth onthe saw whereby the saw is turned and each tooth is brought intoposition for engagement with the sharpening device.

8. A machine of the class described comprising a suitable frame, a shaftmounted thereon, the shaft having a. plurality of cams thereon, meansfor turning the shaft, means on the frame for rotatably supporting acircular saw in position, means whereby the position of the saw on theframe may be varied, uprights carried by the frame, a second framecarrying a sharpening device movable on the said uprights, means fordriving the sharpening device, together with a plurality of leverscarried by the first frame, each lever being in engagement with one ofthe cams, means actuated by the movement of one of the levers forraising and lowering the second frame on the uprights, means actuated bythe second lever for clamping the saw when any tooth is being sharpened,and other means actuated by the third lever for engagement with theteeth on the saw whereby the saw is turned and each tooth issuccessively brought into position for engagement with the sharpeningdevice.

9. A machine of the class described comprising a frame, a shaft mountedin the frame, a plurality of cams carried by the shaft, means forturning the shaft, adjustable means for rotatably holding a circular sawin position on the frame, uprights carriedby the frame, a second framemovably mounted on the uprights, a sharpening wheel carried by thesecond frame, means for driving the sharpening wheel, a plurality oflevers in engagement with the said cams and rods in engagement with thelevers, one of the rods actuating the second frame whereby thesharpening wheel is moved relatively to the first frame, other meansactuated by the second rod whereby the saw is clamped in posit-ion asany tooth is being sharpened, and means actuated by the third rod, thesaid means embodying a dog for engagement with the teeth on the sawwhereby the successive teeth are brought into position for engagementwith the sharpening wheel.

10. A machine of the class described comprising a frame, a shaft on theframe, cams on the shaft, levers actuated by the cams, means for holdinga saw in position 'on the frame, a grinding device movably supported onthe frame, means actuated by one of the cams for raising and loweringthe grinding device into and out ofengagem-ent with succeeding teeth onthe saw, a lever pivotally supported at one end of the machine, the freeend of the lever being provided with a resilient plug, the leverextending on one side of the saw, a lug carried by the machine on theopposite side of the saw, and means actuated by the other of the saidlevers toward and away from the saw, whereby the saw may be clamped whena tooth is being filed and unclamped when the next succeeding tooth isbrought into grinding position.

11. A machineof the class described comprising a suitable frame, a shaftmounted in the frame, cams on the shaft, a plurality of levers pivotallysupported by the frame, and actuated by the cams, means for holding asaw on the frame, a grinding device movable relatively to the saw, meansactuated by one ofthe levers for actuating the grinding device, aclamping device embodying a pivoted lever adapted to engage one side ofthe saw, one end of the lever having a resilient plug thereon, and meansactuated by the other of the first-mentioned levers for moving the plugtoward and'away from the saw whereby it is held rigidly in positionwhile the tooth is being ground.

12. In a machine of the class described, a suitable frame, a grindingdevice movably mounted on the frame and adapted to come into and out ofengagement with the teeth of a saw, means for actuating the grindingdevice, means for moving the grinding device, and other means embodyinga rod and a slidable element adapted to engage the rod below a certainspeed whereby movement of the grinding device into engagement with thesaw is prevented.

18. In a machine of the class described, a suitable frame, a sharpeningdevice movably mounted on the frame, means for actuating the saiddevice, means for moving the said device relatively to the frame, andother means embodying a reciprocating rod having a recess in one sidethereof, and a slidable element movable into and out of engagement inthe said recess, a centrifugal device for moving the said slidableelement whereby the movement of the sharpening device on the frame intoengagement with the saw is prevented save at or above a certain speed.

14. In a machine of the class described, a

suitable frame, means for holding a saw thereon, a grinding devicemovably mounted on the frame and adapted to come into and out ofengagement with the teeth on the saw, means for actuating the saiddevice, means for moving the said device relatively to the saw, andother means embodying a reciprocating rodhaving a recess in one sidethereof, a slidable element engaging in the said recess, wherebyreciprocation of this rod is prevented, and means embodying acentrifugal device in operative engagement with the slidable elementwhereby when the speed exceeds a certain amount, the slidable elementmoves out of the said recess, thereby permitting the grinding device toengage the saw.

15. A machine of the class described comprising a frame, a saw mountedon the frame, a grinding device movably mounted on the frame and adaptedto come into and out of engagement with the teeth on the saw, means foractuating the said device, means for moving it relatively to the saw,and other means embodying a reciprocating rod having a recess in oneside thereof, a slidable element normally seated in the said recess,together with a centrifugal device engaging the said slidable elementthrough the medium of a lever and a link whereby when the speed exceedsa certain amount the slidable element will move out of the recess andpermit the grinding device to come into engagement with the saw.

16. In a machine of the class described grinding device carried by thesecond frame, means for actuating the said device, other means forreciprocating the second frame on the first whereby the said devicemoves into and out of engagement with the successive teeth on the saw, areciprocating rod operatively connected to the reciprocating means forthe second frame, a recess in the side of the rod, a slidable elementengaging in the recess, a centrifugal device actuated by the means foractuating the grinding device, the said centrifugal device embodyinglevers having balls at the ends thereof and a slidable rod operativelyconnected to the balls, the said rod actuating the said slidable elementthrough the medium of a lever and a link whereby as the speed increasesthe centrifugal device will move the slidable element out of the recess,thereby permitting the grinding device to come into and out ofengagement with the teeth on the saw.

17. The combination of clamping means for av saw embodying relativelymovable plugs for engagement with opposite sides of the saw, means forperiodically moving one of the plugs relatively to the other out ofengagement with the saw, and means for periodically turning the saw inorder to bring the teeth thereon into successive position for grinding,the saw turning means operating alternately the clamping means.

18. In combination with grinding means for a saw, clamping means adaptedto engage opposite sides of the saw to hold the same in position forgrinding, means in which the saw is rotatably mounted, means forperiodically bringing the clamping means out of engagement with the saw,and other means for turning the saw in order to bring the teethsuccessively into position for grinding, the clamping means and thesawmoving means operating alternately.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

ABRAHAM L. KIRKWOOD.

comprising a suitable frame, means on the WVitnesses:

frame for revolublysupportlng a saw, a sec- D. R. VAUGI-IT,

0nd frame movably mounted on the first, a J. T. HORN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, I). 0.

